In each vacuum tube there is a U pipe with direct
flow-through that is connected to the header pipe inside manifold. This
U pipe is seamed in an aluminium heat transfer fin in the interior of vacuum
tube that transmits the heat from the interior tube to the U pipe. Solar
radiation permeates the outer glass tube and is captured on the outside
of inner glass tube by highly selective sputter layer. The captured solar
radiation is transmitted to flush-contact aluminium shield and then copper
pipe filled with heat transfer fluid. The 360°aluminum heat transfer fin
assures the fastest energy transfer.

PERFORMANCE

RS collector has achieved a comparable high
efficiency and with a very small heat loss coefficient. The COST/KWH value
is smaller than most other collectors which mean you pay less for each KWH
out put for our collector.

(n0=0.880 a1=0.505 a2=0.019) Above data is given to absorber
area

Efficiency calculation from RIDDERS-SOLAR U-TUBE

Optical Efficiency n0

1st order heat loss a1

2nd order heat loss a2

Temp difference Tm-Ta

Solar IrradianceG

efficiency n

0.696

0.4

0.015

50

800

0.624

ABOVE DATA IS GIVEN TO APERTURE AREA

Tm-Ta: Difference between collector out let
and in let temperature. Here we give value of 50 which is the normal temperature
you require your collector to rise. G: The amount of solar energy which
hits your collector absorbing elementa1, a2: 1st and 2nd order heat
loss of your collector and the smaller value is the better performance your
collector has.Above table gives you a comparison between efficiencies
of different collectors when you want your collector to rise your cold water
temperature by 50 degree.

QUALITY

RIDDERS-SOLAR collector is EN12975 tested and
solar keymark certified. Quality Management System certified to ISO 9001
is applied at our mill. Each RS is individually tested for leakage and other
defects. Anodized aluminum case and frame ensures no corrosion will happen
to RS collector

Installation is easy even on whatever surface

Different systems you can have:

Split systems

Active open loop system
(RST-AOL)

An Open Loop System is for climates where there
is no risk of freezing.Recirculation freeze protection can be provided
by the Recirculation feature in the controller. An Open LoopWater Heating
System provides many advantages. It is the simplest and typically the least
expensive active system to install. There is no heat exchanger, which allows
efficient heat transfer directly to the water. The system operates at standard
line pressure. It is simple to add capacity to the system if demand changes.
The system integrates easily with existing systems.

Tank capacity and collector match may be changed
on different regions.

NOTE：Absorber area is the part of the collector
that actively absorbs the light rays. For solar tubes this is defined as
the cross-sectional area of the inner tube (selective coated) measured using
the outside diameter.(Eg. 0.047 x 1.72m = 0.08m2 for a 58/1800 tube)
Aperture area is the part of the collector through which light enters. For
evacuated tubes this refers to the cross-sectional surface area of the outer
clear glass tube measured using the internal diameter, not the outside diameter.

Next to the U-TUBE system that is the best system
for use in Belgium and countries with not a very high sunshine rate,
we offer also the following systems:

Open loop systems based on flat panel system, U-tube
system or Heat pipe system. Those systems have an integrated boiler.

Schematic layout from a closed loop system.
As also the evolution with those systems is quite fast, we advise you to
contact us for the latest technologies. We do the calculations for you to
see what system will be the best for your use.

Here an example from a Solar
Collector placed on a flat roof, connected to a double coil storage tank
of 350 Liters. This U-Tueb collector from RIDDERS-SOLAR is using vacuum
tubes with the highest purity what is available now regarding the glass
that is used for the vacuum tubes.